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Mechanical Engineering Objective Questions { Engineering Mechanics }



92. In the lever of third order, load W, effort P and fulcrum F are oriented as follows about xx and yy axes, then M.I. of the lamina about axis zz, which is perpendicular to xx and yy, equal to
A.W between P and F
B.F between W and P
C.P between W and F
D.W, P and F all on one side

93. The angle which an inclined plane makes with the horizontal when a body placed on it is about to move down is known as angle of
A.Friction
B.Limiting friction
C.Repose
D.Kinematic friction

94. In actual machines
A.Mechanical advantage is greater than velocity ratio
B.Mechanical advantage is equal to velocity ratio
C.Mechanical advantage is less than velocity ratio
D.Mechanical advantage is unity

95. In ideal machines
A.Mechanical advantage is greater than velocity ratio
B.Mechanical advantage is equal to velocity ratio
C.Mechanical advantage is less than velocity ratio
D.Mechanical advantage is unity

96. The velocity ratio in case of an inclined plane inclined at angle ? to horizontal and weight being pulled up the inclined plane by verticle effort is
A.Sin?
B.1/ sin?
C.1/ cos?
D.Tan?

97. When P is the effort and W is the load then linear law of machines is given by the relation
A.W = mP + C
B.W = mP - C
C.P = mW - C
D.P = mW + c

98. In a simple screw Jack the pitch of the screw is 9 mm and the length of the handle operating the screw is 45 cm, then the velocity ratio of system will be
A.5
B.157
C.314
D.15.7

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